CISPR 11:2015/AMD1:2016

CISPR 11 ®
Edition 6.0 2016-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
IN TERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE
C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 1
AMENDEMENT 1
Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement

Appareils industriels, scientifiques et médicaux – Caractéristiques de
perturbations radioélectriques – Limites et méthodes de mesure

CISPR 11:2015-06/AMD1:2016-06(en-fr)

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CISPR 11 ®
Edition 6.0 2016-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
IN TERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

C OMITÉ INTERNATIONAL SPÉCIAL DES PERTURBATIONS RADIOÉLECTRIQUES

AMENDMENT 1
AMENDEMENT 1
Industrial, scientific and medical equipment – Radio-frequency disturbance

characteristics – Limits and methods of measurement

Appareils industriels, scientifiques et médicaux – Caractéristiques de

perturbations radioélectriques – Limites et méthodes de mesure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-3435-8

– 2 – CISPR 11:2015/AMD1:2016
© IEC 2016
FOREWORD
This amendment has been prepared by CISPR Subcommittee B: Interference relating to
industrial, scientific and medical radio-frequency apparatus, to other (heavy) industrial
equipment, to overhead power lines, to high voltage equipment and to electric traction.
The text of this standard is based on the following documents:
CDV Report on voting
CISPR/B/627/CDV CISPR/B/639A/RVC

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
Introduction to Amendment 1
This Amendment introduces the fully-anechoic room (FAR) for measurements of the
disturbance field strength in the range 30 MHz to 1 GHz on equipment in the scope of
CISPR 11.
It contains the complete set of requirements for measurement of radiated disturbances from
equipment fitting into the validated test volume of a given FAR. It specifies a separation
distance of 3 m and restricts use of the FAR to measurements on table-top equipment.
At the moment the FAR can be used:
• for measurements on table-top equipment fitting into the validated test volume of the given
FAR,
• for a separation distance of 3 m only, and
• if the FAR was validated according to CISPR 16-1-4.

© IEC 2016
The limits for class A and class B group 1 equipment in this CDV base on the limits in the
generic emission standards IEC 61000-6-3:2006/AMD 1 (2010) and
IEC 61000-6-4:2006/AMD 1 (2010). The limits for class A and class B group 2 equipment
were derived using the same approximation formula as used when deriving the limits for the
generic emission standards in mid of the years 2000 to 2010. CISPR/H/104/INF, published in
2005, gives detailed explanations how these limits for the FAR were derived.
More detailed background information is still found in CISPR/B/627/CDV.
CISPR/B WG1 in October 2015
3 Terms and definitions
Add, after the existing definition 3.19, the following new terms and definitions:
3.20
fully-anechoic room
FAR
shielded enclosure, the internal surfaces of which are lined with radio-frequency-energy
absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the frequency
range of interest
3.21
open-area test site
OATS
facility used for measurements of electromagnetic fields the intention for which is to simulate
a semi-free-space environment over a specified frequency range that is used for radiated
emission testing of products
Note 1 to entry: An OATS typically is located outdoors in an open area, and has an electrically-conducting ground
plane.
3.22
semi-anechoic chamber
SAC
shielded enclosure, in which five of the six internal surfaces are lined with radio-frequency
energy absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the
frequency range of interest, and the bottom horizontal surface is a conducting ground plane
for use with OATS test set-ups
6.1 General
Add, at the end of the existing text, the following new paragraph:
Where this standard gives options for testing particular requirements with a choice of test
methods, compliance can be shown against any of the test methods, using the specified limits
with the restrictions provided in the relevant tables. In any situation where it is necessary to
retest the equipment, the test method originally chosen should be used in order to ensure
consistency of the results.
6.2.2.3 Frequency range 150 kHz to 1 GHz
th
Replace, in the existing 4 paragraph of this subclause, the first sentence by the following
new sentence:
On an open-area test site (OATS) or in a semi-anechoic chamber (SAC), class A equipment
can be measured at a nominal distance of 3 m, 10 m or 30 m (see information in Table 6), and
class B equipment at a nominal distance of 3 m or 10 m (see information in Table 7).

– 4 – CISPR 11:2015/AMD1:2016
© IEC 2016
Add, before the existing Table 6, the following new paragraph:
In a fully-anechoic room (FAR) class A or class B equipment can be measured at a nominal
distance of 3 m (see information in Table 6 and Table 7), provided that the EUT fits into the
validated test volume of the given FAR. In conjunction with measurements according to this
standard, use of the FAR is restricted to table-top equipment.
Table 6 – Electromagnetic radiation disturbance limits for class A group 1 equipment
measured on a test site
Replace the existing table by the following:
Table 6 – Electromagnetic radiation disturbance limits
for class A group 1 equipment measured on a test site
OATS or SAC FAR
b b, c
10 m measuring distance 3 m measuring distance 3 m measuring distance
Frequency range rated power of rated power of rated power of
d a, d d a, d d a, d
MHz ≤ 20 kVA > 20 kVA ≤ 20 kVA > 20 kVA ≤ 20 kVA > 20 kVA
Quasi-peak Quasi-peak Quasi-peak Quasi-peak Quasi-peak Quasi-peak
dB(µV/m) dB(µV/m) dB(µV/m) dB(µV/m) dB(µV/m) dB(µV/m)
52 62
decreasing decreasing
linearly with linearly with
30 – 230 40 50 50 60
logarithm of logarithm of
frequency to frequency to
45 55
230 – 1 000 47 50 57 60 52 55
On an OATS or in a SAC, class A equipment can be measured at a nominal distance of 3 m, 10 m or 30 m. In case
of measurements at a separation distance of 30 m, an inverse proportionality factor of 20 dB per decade shall be
used to normalize the measured data to the specified distance for determining compliance.
At the transition frequency, the more stringent limit shall apply.
In the frequency range 30 MHz to 230 MHz, the limit for measurements in the FAR decreases linearly with the
logarithm of frequency.
a
These limits apply to equipment with a rated power of > 20 kVA and intended to be used at locations where
there is a distance greater than 30 m between the equipment and third party sensitive radio communications.
The manufacturer shall indicate in the technical documentation that this equipment is intended to be used at
locations where the separation distance to third party sensitive radio services is > 30 m. If these conditions are
not met, then the limits for ≤ 20 kVA apply.
b
The 3 m separation distance applies only to small size equipment meeting the size criterion defined in 3.17.
c
The table-top equipment shall fit into the validated test volume of the FAR.
d
Selection of the appropriate set of limits shall be based on the rated a.c. power stated by the manufacturer.

© IEC 2016
Table 7 – Electromagnetic radiation disturbance limits for class B group 1 equipment
measured on a test site
Replace the existing table by the following:
Table 7 – Electromagnetic radiation disturbance limits
for class B group 1 equipment measured on a test site
OATS or SAC FAR
a a, b
10 m measuring distance 3 m measuring distance 3 m measuring distance
Frequency range
Quasi-peak Quasi-peak Quasi-peak
MHz
dB(µV/m) dB(µV/m) dB(µ
...